Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b6b89e6040ee7a…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 09:44:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0fbe30e273fc9358a0ca4d4a22c22568 SHA-1: c5e91a461c2c35c524ae2206fd472789d7afb64f SHA-256: 66b6b89e6040ee7a99b08afaa344f88c50093a419d799510418ece139be5de8d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and free account generators. The document body and embedded links suggest a lure to drive traffic to potentially malicious or phishing sites. No scripts were extracted, but the presence of numerous SEO-optimized PDF links indicates a link farm or content-spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/someone-hacked-my-account-on-roblox-game-hack In PDF document text
    • http://zarinnameh.ir/images/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/hack-mm2-roblox_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-stuff-in-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-generator-simulator_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/best-free-no-virus-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-website-bloxburg-sign_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://robuxhaxs.comIn PDF document text
    • https://www.roblox.coIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF2 25308 bytes
SHA-256: 58caf2ba267120aaabbeeee17ede1daae949d1d8cd862c7aebe4749c5cc6cc94
font_01_sfnt_off00008afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 19236 bytes
SHA-256: a04e40a48958bbabd3efdaa621fb843631caf7044599e631040984e2bb1d4550

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